Process of alloying molybdennum with ferrous alloys



Patented Nov. 3, 1942 2,300,943 ICE PROCESS OF ALLOYING MOLYBD'ENNUPIIWITH FERROUS ALLOYS Arthur Linz, New York, N. Y., assignor to ClimaxMolybdenum Company, New York, N. Y., a cor poration of Delaware NoDrawing. Application April '7, 1941, Serial No.,387,286

2 Claims. I (01. 75-133) The present invention relates to new and usefulprocess of producing molybdenum containing ferrous alloys.

Objects and advantages of the invention willbe set forth in parthereinafter and in part will be obvious herefrom, or may be learned bypractice with the invention, the same being realized and attained bymeans of the compositions, steps,

ment on my prior patents under certain conditions of operation and forcertain purposes and it is an object of my present invention to providemolybdenum containing briquettes for the production of ferrous alloyswhich-are reduced and dissolved even more readily than those of my priorpatents .and which give an even higher recovery of molybdenum in thepresence of certain elements. A further object of the invention is theprovision of an improved process for the production of ferrous alloyscontaining molybdenum and, if desired, other alloying agents withsubstantially complete recovery of the alloying agent and with increasedspeed.

' In accordance with the present invention there are provided briquettescomprising an intimate mixture of an oxide of molybdenum and a pluralityof reducing agents, preferably carbon and one or more of the following:aluminium, magthe molten metal'in the ladle or to the charge:

in the furnace in the desired quantity and are in excess of 10% up to 5%or,6% of one or more active reducing agents, such as aluminium,magnesium, calcium or silicon, the mixture being formed into uniformbriquettes by powerful hydraulic or other pressure to give dense,compact briquettes with the various substances in as intimate contact aspossible.

The required quantity of the molybdenum, in the form of thesebriquettes, is added to the molten ferrous metal in the ladle, or theymay be charged to the furnace, and the heat of the metal quickly causesthe carbon and the more active reducing agents to reduce the molybdenumoxide to metallic molybdenum which is absorbed in the molten metal. j

The more active reducing agents shorten the time required to completethe reaction and absorption of the molybdenum into the forrous metal, asmight be expected, and also give a more complete recovery of themolybdenum. Further, they eifect further economies in alloy production,

when chromium or vanadium are present in the alloy as they avoid thenecessity for the separate or later addition of ferro-silicon and alsoprevent any substantial loss of the chromium or vanadium which mightotherwise occur. Thus, the reduction of the, briquettes whenaccomplished in part by reducing agents more active than carbon, and inpart by carbon, does not interfere with the retention by the alloy ofits chromium andvanadium content.

As specific examples of briquettes in accordance with the presentinvention, the following are given:

Parts Molybdenum trioxide .or dioxide 100 Still pitch or othercarbonaceous binder- 5 to Aluminium powder 3 to The aluminium may bereplaced in whole or in part by up to 10 or 12 parts silicon metal, upto 15 or 18 parts magnesium or up to parts of calcium metal, orbymixtures of these metals.

The invention in its broader aspects is not limited to the specificcompositions. processes and steps described and departures may be madetherefrom within the scope of the accompanying claims without departingfrom the principles of the invention and without sacrificing its chiefcalcium and magnesium, in an amount suflicient to reduce the molybdenum.

ARTHUR LINZ.

